An element of atomic mass 40 has 2, 8, 8, 2 as the electronic configuration. Which one of the following statement regarding this element is NOT correct?
Correct answer: D. It forms an acidic oxide
- A. It forms a basic oxide
- B. It belongs to Group 2 (IIA)
- C. It belongs to Period 4
- D. It forms an acidic oxide
Explanation
The element with this configuration is Calcium (Ca), an alkaline earth metal. As a metal, it forms a basic oxide (CaO). Therefore, the statement that it forms an acidic oxide is incorrect.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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